* {
  margin: 0;
  padding: 0;
}
html,body {
  width: 100%;
  height: 100%;
}
#root {
  width: 100%;
  height: 100%;
}
.appwrap {
  width: 100%;
  height: 100%;
  display: flex;
}
.appwrap .left  {
  width: 100px;
  height: 100%;
  background: pink;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.appwrap .right {
  flex: 1;
  background-color: yellow;
  height: 100%;
  overflow-y: auto;
}